Anonymous Coward wrote on 2021-04-14, 14:24:
I did mean 4 x16MB = 64MB. If it couldn't be made at 40-50ns, there wouldn't be a point as 60ns is readily available.
There are definitely 486 boards that accept them. Though, admittedly it's more of a niche item.
16MB 30pin simms are more of a curiosity, it's true. They don't work on older boards, and the newer board that do take them also accept 72 pin simms, which are usually available at a lower price points for the same capacity
While some people will no doubt want to get as much ram as possible on their 486, I feel that any value you get by adding more than 32MB of ram to a 486 is offset by the time you spend watching the POST RAM count each time the computer boots.
But I'd be really curious to see what kind of improved timings you can get with a high capacity , 1 chip 72 pin simm with 50ns FPM ram.